<template>
    <div class="icons">
        <swiper ref="mySwiper" :options="swiperOptions">
          <!-- 每一个 swiper-slide 是一个轮播图 -->
          <swiper-slide v-for="(page, index) of pages" :key="index">
            <div class="icon" v-for="item of page" :key="item.id">
              <div class="icon-img">
                <img class="icon-img-content" :src="item.imgUrl" />
              </div>
              <p class="icon-desc">{{item.desc}}</p>
            </div>
          </swiper-slide>
        </swiper>
    </div>
</template>

<script>
export default {
  name: 'HomeIcons',
  props: {
    list: Array
  },
  data () {
    return {
      swiperOptions: {
        autoplay: false
      }
    }
  },
  computed: {
    pages () {
      const pages = []
      this.list.forEach((item, index) => {
        const page = Math.floor(index / 8)
        if (!pages[page]) {
          pages[page] = []
        }
        pages[page].push(item)
      })
      return pages
    }
  }
}
</script>

<style lang='stylus' scoped>
  @import '~styles/varibles.styl'
  @import '~styles/mixins.styl'
  .icons >>> .swiper-container
    height: 0
    padding-bottom: 50%
  .icons
    margin-top: .1rem
    .icon
      overflow: hidden
      position: relative // https://www.ruanyifeng.com/blog/2019/11/css-position.html
      float: left
      width: 25%
      height: 0
      padding-bottom : 25%
      .icon-img
        position: absolute // 父级元素不能为 static (不设置默认也为 static)），否则是相对根级Dom
        top: 0
        left: 0
        right: 0
        bottom: .44rem
        box-sizing: border-box
        padding: .1rem
        .icon-img-content
          display: block
          margin: 0 auto // 设置成 block 后再设置这个就会居中
          height: 100%
      .icon-desc
        position: absolute
        left: 0
        right: 0
        bottom: 0
        height: .44rem
        line-height: .44rem
        text-align: center // 文字居中
        color: $darkTextColor

        // ... 的效果，封装在 assets/styles/mixins.styl
        ellipsis()
</style>
